Tohutoro APA (7th ed.)
Spitzer, H. F. Enrichment of Arithmetic (1a.ed.). Webster Divsion McGraw - Hill.
Tohutoru Kātū Chicago (17th ed.)
Spitzer, Herbert F. Enrichment of Arithmetic. 1a.ed. Buenos Aires: Webster Divsion McGraw - Hill.
Tohutoro MLA (9th ed.)
Spitzer, Herbert F. Enrichment of Arithmetic. 1a.ed. Webster Divsion McGraw - Hill.
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